Today, the Internet has become an integral part of our lives. From communicating with a bank to shopping on a trip, every aspect of our lives is connected to the Internet.
Since the Internet is widely used these days, cybersecurity is a major concern for most web users, as each time we receive more and more news about new cyber attacks.
Currently, the concept of cyber attack is very common, and it is becoming an increasing headache for many IT companies and enterprises. In recent years, some big names, such as Google, The New York Times, etc., have been the victims of cyber attacks.
In today's post, we will learn about DNS attacks, how they work and how to deal with them.
What DNS attack?
Indeed, DNS attacks occur when a hacker is able to find flaws for their subsequent exploitation in DNS (Domain Name System).
Hackers exploit vulnerabilities, making possible a DNS attack. To understand how DNS attacks work, you first need to understand how DNS works.
For those who don’t know, a domain name system is a protocol that interprets an alphabetic (alphabetic) domain name into an IP address. In short, its main function is to turn a user-friendly domain name into an IP address, which in turn is computer-friendly.
How does it work DNS?
When a user enters a domain name in a browser, a program available on the operating system known as “DNSresolver” looks for the IP address of that domain name.
First, the DNS resolver looks for its own local cache and checks if it already has an IP address for this domain. If he does not find it in the local cache, he queries the DNS server to check if he knows the exact IP address for this domain.
DNS servers run in a loop, which means they can query each other to find a DNS server that knows the correct IP address of a domain name.
Once the DNS resolver finds the IP address, it returns the IP address of the requesting program. DNS caches the domain address for future reference.
Although the Domain Name System is quite powerful, it seems less security-oriented. Perhaps this is why we notice different types of DNS attacks.
To minimize the potential for DNS attacks, server administrators must take some necessary steps. They can use the updated version of DNS software and regularly configure servers to perform duplication. On a personal level, users can reset their DNS cache to avoid security risks. If you do not know how to clear (reset) the DNS, read the corresponding informative post on hostinger.com.
How hackers use DNS?
The biggest problem with the DNS system is that if in any account a hacker can find a way to replace the resolved IP address of a website with a stolen IP address, then anyone trying to access this website will be sent to fake address. The user will not have the slightest idea that he is accessing the wrong address.
One of the main problems with configuring a DNS server is that it does not remember its default configuration. Attackers are happy to use this loophole.
Main types DNS attacks
Over the past few years, there has been a sharp increase in DNS attacks. And these attacks are not limited to small websites.
Many popular sites, such as Reddit, Spotify, Twitter, also complained about their inaccessibility to thousands of their users.
As DNS attacks are becoming more common, we should learn to identify DNS attacks so that we can better deal with the situation. Let's look at the types of DNS attacks.
Zero–day attack (Zero-day attack) – in this type of attack, an attacker exploits a previously unknown vulnerability in the DNS server software or protocol stack.
Fast Flux DNS (Fast flow)– hackers change the frequency of DNS records to a higher one to redirect DNS queries. This method helps an attacker to avoid detection.
DNS–Spofing (DNS spoofing)– DNS spoofing is also known as DNS cache poisoning. This is a type of computer security hack. Attackers or hackers damage the entire DNS server, replacing the resolved IP address with a fake IP address in the server cache. In this way, they redirect all traffic to a malicious website and collect important information.
This is one of the most popular phishing techniques that cybercriminals regularly use to steal information. Because users type the correct domain address in their browsers, they never realize that they are accessing a fake or stolen website.
Therefore, it becomes more difficult to detect this attack. Sometimes users cannot identify it before the time to live (TTL) expires. TTL, or time to live, is the time that the DNS resolver remembers the DNS query before it expires.
The best way to prevent a DNS cache poison attack is to clear the DNS cache from time to time.
DDoS attack on DNS
DDoS Attack called a Distributed Denial-of-service attack. This usually happens when several systems flood the resources of the target system. Attackers can use this attack against various types of systems, which also include a DNS server.
A DDoS attack can lead to the failure of the entire DNS server and make Internet access inaccessible to users. However, they will be able to access websites that they recently accessed if they are stored in the local cache.
Attacking a DNS server can be a huge network security issue. Therefore, this should not be taken lightly by business. They must implement state-of-the-art defenses to reduce risks and prevent the effects of such attacks.
How you can defend against this attack depends on the role of your systems in the environment. However, you can take the following steps.
Get regular insights into what's happening on the net. You can use technologies such as IPFIX, NetFlow, etc. to achieve the desired result.
DDoS attacks usually gain access to the network at an excessive packet rate per second. Therefore, you should consider various ways to solve these kinds of problems.
DNS attacks can be fatal for your security. Therefore, you must take all possible steps to prevent them.
Have you ever been a victim of a DNS attack? How did you manage to prevent them? Please share your experience with us.